Simple port fwd. 1 interface

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I have been tearing my hair out with this (and not enough left to keep going).
I have a linux box (raspberry pi) single ethernet interface in a heavily filtered DMZ with external ports fwd'd that can access an internal IP's (different subnet).
I want to forward the traffic. Should be simple I thought and in fact I have it working using 'nc' as a 'one hit' as follows
Code:
mkfifo backpipe
nc -l 80 0<backpipe | nc 172.16.100.102 80 1>backpipe
But I need this to be a permanent fwd. So after much googling tried to set up iptables to do this.
IP of pi is 192.168.1.8 it has an e
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I have been tearing my hair out with this (and not enough left to keep going).
I have a linux box (raspberry pi) single ethernet interface in a heavily filtered DMZ with external ports fwd'd that can access an internal IP's (different subnet).
I want to forward the traffic.